CONTENTS. 



PAGE. 



Material 49 



Technique 50 



Short, survey of the process of spenruitogenesis 51 



First period 55 



Second period 50 



Third period 59 



Fourth period 60 



Chondriosomes 62 



Sertoli cells 63 



Spermatogonia 63 



Spermatocytes 63 



Spermiogenesis 64 



First period 64 



Second period 65 



Third period 65 



Fourth period 67 



Discussion 69 



The apparatus of Golgi 7T5 



Discussion of apparatus of Golgi 75 



Bibliography 82 



Explanation of figures 84 



48 



